This is the full, official Amstrad documentation of the firmware for the CPC range of computers. It is a superset of the material contained in SOFT158, the manual covering the CPC464 only.
The "original" file uploaded was the PDF version, and it is a scalable vector-only file with "infinite" resolution. All the other files are rasterised derivations, and thus of lesser quality/resolution.
ABBYY FineReader 11.0 (Extended OCR)
Locomotive software have kindly publicly allowed all their old publications to reside in the public realm.